Tube leak detector



FIG. 1 is a front elevational view of a tube leak detector showing my new design, the rear elevational view being a mirror image thereof;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a right side elevational view thereof. 

The ornamental design for a tube leak detector, as shown and described. 